Families are being hit by a series of extra charges from airports and airlines including meals, drinks, long stay parking costs and last minute fees for checking in luggage.
In some extreme cases bills could work out as costing more than the cost of the flight.
James Walker, of customer resolution website Resolver, told Sunday People: “Airports should give customers a break.”
At Gatwick a week’s long-stay parking this month costs £165 but £74 if you booked ahead.
For Birmingham a week’s long-stay parking will put you out of pocket £107.08 – and without booking it could cost £288 for the week.
At Birmingham and Manchester Airports it’s a non-refundable £1 to hire a baggage trolley while a standard bottle from an airport vending machine costs £2 while a sandwich costs £8.
It costs £10 to avoid passport control queues at Gatwick.
The most expensive airport was named as Birmingham, including Ryanair’s check-in baggage fees, with a bill of £389.08.
Manchester cost £381 and Gatwick cost £302.
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The Airport Operators Association said: “Non-aeronautical income allows airports to keep charges to airlines low, benefiting travellers through lower air fares and increased connectivity.
“It also supports the record investments airports are making in improved facilities and infrastructure.”